Ive notices something when detecting lack of indian head pennies and theres no logical explaination for this the only one I found with the etrac was super deep at 9 inches,I want to find more indians in 2013 and I don't think the stock coil is doing a good job finding Indians.My theory is indian have been sinking for 104 years at the least and they are not going to be shallow,due to the large amounts of small earth quakes thousands of rains and snow storms and so on,I wonder if a super deep seeking coil would get the job done for indian head pennies,Im guessing most of them are between 9 and 18 inches deep.